Because in US politics, we generally have three types of politicians: MAGA, corporate Republicans, and corporate Democrats.
Mamdani represents a possible fourth way, a way that (hopefully) values workers over capital.
When he says "billionaires shouldn't exist" he is re-affirming his commitment to this fourth way, and that is a important positive sign.
Facing Worlds has to be one of the most defense-favored maps in CTF history.
So difficult to to breach into the enemy's fort, only a couple paths home, no cover, high prevalence of snipers.
In order to score, your team had to have full map control.